import Vue from 'vue'
// 导入组件
import RestoreFileDialog from './Dialog.vue'
// 使用基础 Vue 构造器，创建一个“子类”
const RestoreFileConstructor = Vue.extend(RestoreFileDialog)

let restoreFileInstance = null
/**
 * 初始化还原文件实例
 * @param {string} deleteBatchNum 删除批次号
 * @param {number} filePath 文件路径
 */
const initInstanceRestoreFile = (deleteBatchNum, filePath) => {
  restoreFileInstance = new RestoreFileConstructor({
    el: document.createElement('div'),
    data() {
      return {
        deleteBatchNum,
        filePath
      }
    }
  })
}
/**
 * 还原文件 Promise 函数
 * @returns {Promise} 抛出确认和取消回调函数
 */
const showRestoreFileDialog = (obj) => {
  // 非首次调用服务时，在 DOM 中移除上个实例
  if (restoreFileInstance !== null) {
    document.body.removeChild(restoreFileInstance.$el)
  }
  const { deleteBatchNum, filePath } = obj
  return new Promise((reslove) => {
    initInstanceRestoreFile(deleteBatchNum, filePath)
    restoreFileInstance.callback = (res) => {
      reslove(res)
      // 服务取消时卸载 DOM
      if (res === 'cancel' && restoreFileInstance !== null) {
        document.body.removeChild(restoreFileInstance.$el)
        restoreFileInstance = null
      }
    }
    document.body.appendChild(restoreFileInstance.$el) //  挂载 DOM
    Vue.nextTick(() => {
      restoreFileInstance.visible = true //  打开对话框
    })
  })
}

export default showRestoreFileDialog
